diff options
| author | Ard Biesheuvel <ard.biesheuvel@arm.com> | 2020-10-27 18:02:40 +0100 |
|---|---|---|
| committer | Tomas Mraz <tmraz@fedoraproject.org> | 2020-10-29 17:17:21 +0100 |
| commit | fcf6e9d056162d5af64c6f7209388a5c3be2ce57 (patch) | |
| tree | a55bc8f6d66bbb0fb0ac03b83421aa15bd4e79cf | |
| parent | 728d03b576f360e72bbddc7e751433575430af3b (diff) | |
crypto/poly1305/asm: fix armv8 pointer authentication
PAC pointer authentication signs the return address against the value
of the stack pointer, to prevent stack overrun exploits from corrupting
the control flow. However, this requires that the AUTIASP is issued with
SP holding the same value as it held when the PAC value was generated.
The Poly1305 armv8 code got this wrong, resulting in crashes on PAC
capable hardware.
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13256)
| -rwxr-xr-x | crypto/poly1305/asm/poly1305-armv8.pl | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/poly1305/asm/poly1305-armv8.pl b/crypto/poly1305/asm/poly1305-armv8.pl index d2d875ad6c..113a2151b6 100755 --- a/crypto/poly1305/asm/poly1305-armv8.pl +++ b/crypto/poly1305/asm/poly1305-armv8.pl @@ -866,8 +866,8 @@ poly1305_blocks_neon: st1 {$ACC4}[0],[$ctx] .Lno_data_neon: - .inst 0xd50323bf // autiasp ldr x29,[sp],#80 + .inst 0xd50323bf // autiasp ret .size poly1305_blocks_neon,.-poly1305_blocks_neon |